发明名称 |
Pre-expanding process and apparatus for the same |
摘要 |
A process for preparing pre-expanded particles of a thermoplastic resin which comprises; heating under an elevated pressure an aqueous dispersion comprising thermoplastic resin particles containing a volatile foaming agent and an aqueous medium in a pressure vessel; releasing the dispersion from the pressure vessel into a space within a sealed low-pressure vessel wherein the pressure is lower than that in the pressure vessel, whereby expanding the thermoplastic resin particles to give pre-expanded particles; and simultaneously recovering the foaming agent volatilized from the thermoplastic resin particles by discharging the foaming agent out of the space in the low-pressure vessel with controlling the pressure in the low-pressure vessel to substantially a given pressure. According to the process, the release of the volatile foaming agent into the air is prevented.
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申请公布号 |
US4525485(A) |
申请公布日期 |
1985.06.25 |
申请号 |
US19840647659 |
申请日期 |
1984.09.06 |
申请人 |
KANEGAFUCHI KAGAKU KOGYO KABUSHIKI KAISHA |
发明人 |
MAEDA, HIROFUMI;NAKAMURA, KYOICHI;FUKUI, HISATOSHI |
分类号 |
B29C44/34;C08J9/228;C08J11/02;(IPC1-7):C08J9/22 |
主分类号 |
B29C44/34 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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